The IPL (exploded parts list) for your saw can be found here:
EchoUSAhttp://www.echo-usa.com/pdf/documentation/CS3000T1T1E_081303.pdf
Page 8 is the fuel system detail. Compared to most manufacturers’ this is a novel, a good one. Use it as a guide, it doesn't look to difficult. Take extensive notes and digital photo or two may pay huge dividends. HTH
Lou

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code p0440 refers to evaporative emission (EVAP) system--malfunction=== causes --hose connections --intake leak--EVAP canister purge valve
code po441 refers to EVAP --incorrect flow detected==causes the same as for po440
code po446 refers to EVAP system vent control --circuit malfunction===causes --wiring---EVAP can purge valve--ECM
generally I would replace the purge valve as it is common to all codes

this is becoming a common problem, what is going on with your car is that as you fill the fuel tank you have to displace the air inside the tank( as the fuel goes in the air has to come out ) this is done by the purge system, as the fuel goes in the air is displaced threw a purge canaster the canster trapes any fuel vapers that are in the displaced air and as you are driving the car the vapors are burned by the engine, this canister is either pluged or the valve that opens and closes the canister is stuck so as you fill the tank the air can not get out so you get back pressure in the fill neck and this causes the pump to shut off, bottom line you need to have the purge system checked. it might be a bad canister or a bad switch could also be one of the hoses to the canaster, heres the bad news to replace almost anything on the system the fuel tank will have to be removed and that can be expenceve....sorry

take side cover off and remove screws that hold the pump bulb in place and remove the gas lines make sure you put the right one back on each side.the one that sucks goes to carb. and other goes to gas tank.